
For many years I waged war on the sound tech thinking they were a worthy opponent, but then I discovered I was just fighting myself.

To expect a sound tech to be at all interested in what your band sounds like when it isn't you who is paying them...

Playing cover gigs made me understand how little people care about the tone of a bass guitar.

Most people don't even know what the thing is or what it's supposed to sound like.

By the end, I was bringing a tube DI and PBasses with flats.

It just always works.

A long way from a Zon through an SVT.

My back...
In all seriousness though, I check brightness through FOH by dead snapping the G string a couple of times,
taste is voicing it somewhere between a dark 'DOK', and a bright 'TIK'. Adjust with passive tone knob or treble on an active bass, not the amp. Not saying this is you, but most bassists think of the tone knob as an on/off kind of thing. The amp is there to amplify what is coming off the instrument, so I try to keep most of the control over the tone, at the instrument.
A lot of bassists get attached to where the knobs are set, or what they think 'their TONE' is, forgetting that bass tone interacts with the room in a variety of unpleasing ways depending on distance from its source.
The other thing is that the tech may be fighting something in the room sonically that isn't apparent (like their ears, damaged from years of playing a strat through a hiwatt). Everything further down this rabbit hole is speculation.